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'Small UART, Static Cahe RAM'
1996\08\25@080425 by Kalle Pihlajasaari

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Hi,

> 1) the 32Kx8 skinnyDIP package is space saving.
> 2) commodity pricing makes them cheap. Real cheap. In fact it's quite ease
>    to strip 256K of it from a non working PC MB with cache RAM aboard.
> 3) Fast. 20ns access time means no worries about the PIC outrunning it.
> 4) Can upgrade memory in 64K sements up to say 128K. Then look at a
> bank switch scheme with larger memories
> 5) Static. no worries about refresh.

Very interesting, I thought it was some funny paged fifo stuff.

> Be aware that the 17CXX only has one hardware serial port. If you want more
> you'll have to add chips. I like the signetics 2691. Does anyone know of a
> 8250/16550 type chip that comes in a 28 pin skinnydip or smaller?

A company called Startech Makes some 28 pin PLCC 16450 (perhaps 16550)
compatible UARTS with only the pins that are needed for ISA bus interfacing
so all the DMA, other polarity chipselects and unused modem control pins
are left off or looped inside as required.

Cheers
--
Kalle Pihlajasaari     spam_OUTkalleTakeThisOuTspamdata.co.za
Interface Products     Box 15775, Doornfontein, 2028, South Africa
+27 (11) 402-7750      Fax: +27 (11) 402-7751

1996\08\25@212954 by Jim Robertson

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>
>> Be aware that the 17CXX only has one hardware serial port. If you want more
>> you'll have to add chips. I like the signetics 2691. Does anyone know of a
>> 8250/16550 type chip that comes in a 28 pin skinnydip or smaller?
>
>A company called Startech Makes some 28 pin PLCC 16450 (perhaps 16550)
>compatible UARTS with only the pins that are needed for ISA bus interfacing
>so all the DMA, other polarity chipselects and unused modem control pins
>are left off or looped inside as required.
>
>Cheers

Also have a look at the 8252 ACE. It is a dual uart and if I remember correctly
sort of like the 8250 in many ways.

-Jim

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